<script lang="ts" setup name="XtxCarousel">
import { BannerItem } from '@/types/data';
import { onMounted, ref, onBeforeUnmount } from 'vue'

const {
    slides,
    autoPlay = false,
    duration = 3000
} = defineProps<{
    slides: BannerItem[] // 要显示的图片
    autoPlay?: boolean // 是否自动播放
    duration?: number // 播放速度
}>()
// 定义轮播图默认显示值
const active = ref(0)
// 点了轮播图右箭头++
const hNext = () => {
    active.value++
    if (active.value > slides.length - 1) active.value = 0
}

// 点了轮播图左箭头--
const hPrve = () => {
    active.value--
    if (active.value < 0) active.value = slides.length - 1
}

let timer = -1
// 自动播放函数
const start = () => {
    if (!autoPlay) return // 判断是否开启了自动播放
    timer = window.setInterval(() => {
        hNext()
    }, duration)
}
// 暂停,清除定时器
const stop = () => {
    clearInterval(timer)
}

// dom生成钩子函数
onMounted(() => {
    start()
})
// 组件销毁的钩子
onBeforeUnmount(() => {
    stop()
})
</script>

<template>
    <!-- mouseenter：鼠标经过（没有冒泡效果，推荐使用，类似hover） -->
    <!-- mouseleave：鼠标离开 （没有冒泡效果，推荐使用）        -->
    <div class="xtx-carousel" @mouseleave="start" @mouseenter="stop">
        <ul class="carousel-body">
            <li v-for="(it, ind) in slides" :key="it.id" :class="{ fade: ind === active }" class="carousel-item">
                <RouterLink to="/">
                    <img :src="it.imgUrl" alt="" />
                </RouterLink>
            </li>
        </ul>
        <a @click="hPrve" href="javascript:;" class="carousel-btn prev"><i class="iconfont icon-angle-left"></i></a>
        <a @click="hNext" href="javascript:;" class="carousel-btn next"><i class="iconfont icon-angle-right"></i></a>
        <div class="carousel-indicator">
            <!-- 鼠标指针移动到元素时触发 -->
            <span @mousemove="active = index" v-for="(item, index) in slides" :key="item.id"
                :class="{ active: index === active }"></span>
        </div>
    </div>
</template>

<style scoped lang="less">
.xtx-carousel {
    width: 100%;
    height: 100%;
    min-width: 300px;
    min-height: 150px;
    position: relative;

    .carousel {
        &-body {
            width: 100%;
            height: 100%;
        }

        &-item {
            width: 100%;
            height: 100%;
            position: absolute;
            left: 0;
            top: 0;
            opacity: 0;
            transition: opacity 0.5s linear;

            &.fade {
                opacity: 1;
                z-index: 1;
            }

            img {
                width: 100%;
                height: 100%;
            }
        }

        &-indicator {
            position: absolute;
            left: 0;
            bottom: 20px;
            z-index: 2;
            width: 100%;
            text-align: center;

            span {
                display: inline-block;
                width: 12px;
                height: 12px;
                background: rgba(0, 0, 0, 0.2);
                border-radius: 50%;
                cursor: pointer;

                ~span {
                    margin-left: 12px;
                }

                &.active {
                    background: #fff;
                }
            }
        }

        &-btn {
            width: 44px;
            height: 44px;
            background: rgba(0, 0, 0, 0.2);
            color: #fff;
            border-radius: 50%;
            position: absolute;
            top: 228px;
            z-index: 2;
            text-align: center;
            line-height: 44px;
            opacity: 0;
            transition: all 0.5s;

            &.prev {
                left: 20px;
            }

            &.next {
                right: 20px;
            }
        }
    }

    &:hover {
        .carousel-btn {
            opacity: 1;
        }
    }
}
</style>